PNR
as defined in Directive (EU) 2016/681 of the European Parliament and of the Council of 27…, Article 3, point (5) (Definitions)
a record of each passenger's travel requirements which contains information necessary to enable reservations to be processed and controlled by the booking and participating air carriers for each journey booked by or on behalf of any person, whether it is contained in reservation systems, departure control systems used to check passengers onto flights, or equivalent systems providing the same functionalities